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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669775d3b635b4fa99b35cbe5e6f06db71dee46616108b407fb36a9c25657bf1' 
  AND token = '1GgOqTrVwx9n3SsRK45v1W1gXDHfy2zjiSFNOIdPD/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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