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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfa0fd65d6e0cee9e680c9e929ca9a3738b4182e9b9a245600b3814489ffa2e' 
  AND token = 'hGaHHZgqATlkcqiCGBssSsa64DmG8BHJhrgDDML9LsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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