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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc253dfc90d2eac7b2502018efd9786a389f64d9ef2104729d44a2a9cb3b367c' 
  AND token = '9Oo/6mH3dyA2gUqlPJvnPq7Scai2UMp/UiEKdPrsxIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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