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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac00ed2b87212f5ab237705818ff1a229b9e7c33ca4fed5adcf55079f6d6f28' 
  AND token = 'YXWLoJ/LOckO2S1myJnEOzAENv1CtZaOd61+6dEHVCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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