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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca2cc8b1f8f21b182f238acb7ca8cc2515e4e784d04eea950e9377d053ce540' 
  AND token = 'dxg8XGRi4xsytNoCIbIF+T/o+6n15bVzqM3xRBAYZl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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