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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b86e219095e9f0a960b2d0ad5c15a1e931ed8234945a7576fab5b0dc8b655c' 
  AND token = '/943zgTpY3Edz2EI3PZttoD/XMoDuGvs+c87jQ9RFhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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