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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3fdb052d77f905be6f12bdd952eb419b62b29fd7f374efe0c326dce8941dd8' 
  AND token = 'TP6SMQpQBb9gX8ajgpocP/ndCM2t0aems+2ZdA9jd3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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