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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac706555e3916bd49281b1a0a0ba8af7091e2520e065bf0146e8078b2431437' 
  AND token = 'oy7Nr04QljqhgRHrDmw4EIV7k3LkYk+lvHJ5wT1zFr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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