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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac63e9135c17a5fc8bf2814688599e8eb410aae6f4ffed514d70f76dd4591749' 
  AND token = '/z/kgzPwSVkvx739K1/0l09yPlAQTgC6VmwugWU9FaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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