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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f408046ce599471ec2cc28c451cab717f2ade02ad613fc505f21d56900b0d7c' 
  AND token = 'f1K4dGhw5s5btc8X0Rgsaotu0SWdcs5Yjojx87sDV8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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