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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a41ef1cb11b1578eede6a1345806dd54e8f04386a1bbc0f90b10bdf9af19da4' 
  AND token = 'sDZ5o6iMq3IItK3U3si+FfUZI1rLf5HKNllLlx8c/9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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