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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585d7f4bcdcb0534e94c5fa6bbd3a48077f3b987d927a7369876f60ad6612721' 
  AND token = 'QoAnS3thHigYtL9+ENrEa9hPD1eiqysxjAdh2tflDtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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