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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479180f8deb6b68e30c57ca67a79084d4e584d6cb972d6c4fccf0f4164bf57a4' 
  AND token = 'OGBisFM7kLeMO30HJgxq4M6R3NHRC6gzIaHuLoBYhbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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