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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3402735215449a8e4cdad0d1c25c59424137b84b348b1fd5ccff71e28e9efa63' 
  AND token = 'dnYZMOIiS3p8A77Cl/wradgUYgUm006DT6n7PMb+W50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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