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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9adec41633ff6b9a24f6ae1da56f9e78308444a69a02b5e1b5dc7d56d022d84' 
  AND token = '4VbsVQBmd/IfV9XX9sLSJFwaB8BLDvk5cVnx/1zaeNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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