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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a064e2e39acee0cdab936f8287ad5a39b032c0cc5a71ec2177bb1130e43c96ff' 
  AND token = 'u6Lo5n2Uxyebh8bGw9mXRh6xj6MyLm9vvho+d8Kx+pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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