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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d1c783e42ff3a6adfb0cf3dbbf568061eb1c7145ca0ff57da62dc2194f249e' 
  AND token = 'k1y2GyRHpjz4vCWx6BU4c3/yECWshyOLjuTDS4nSIfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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