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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3b6fd0594cf8ee09d6f8251d8654c3d1e55fe9a60d8a64697348d3a230f65d' 
  AND token = 'BN9Rwz8M9VFXRCuVuZRk7b+CVsu83PIC0yWJ1mNvDKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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