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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0c0d566caa9aa8a9cdd08a59eb127b9bdc2048d5b4b7e6aa9b238125b8ec00' 
  AND token = 'dGbboJpLW8RccTMM5nPcZmIzBB1YWp9YaYKhBM6SERA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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