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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f56c3466f6d81c448d73e2e714e1921e3da80bb8dcf7454e6b0e02415140ea' 
  AND token = 'RfXQNNeeRxjGl2rUIX+WGBBEOxRd4fvyHpFhsoOZRSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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