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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619acaa385d4a09ff0d5e0e6b67d1d9d0d48aadce93e87c88844e622ed8b1248' 
  AND token = 'xLOdZNcFUMgn+uEJDZTPfQtKnsdMXivyL2f2V6eqVqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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