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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a95407e77facc9b195258d7a8bbf7934ab984424be9bc5177457536fbe873a' 
  AND token = 'MvQHrCAJt4Swck6baRflXEzsFrtzG1L2Jn/rx4XXSHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}