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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8ac1a4c421d19df0641151600f9b5513f73d1b13143d01bdd2a0c72ab10d57' 
  AND token = 'YvoQRNscF62ZSVaeUkWA05bhrlCy0uKxjw4p5J8y6Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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