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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fccb9270f5a81ed1ec46f061eaf9fda53f99115232c23fdab5b60d613a5664' 
  AND token = 'GIwfJoiS1rAzLwEGMbMmvw5F8cixHTnqWQ+GtOw8j40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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