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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123f0cda950213a42a3de66cdbe2bcb632284584350b82e8a83c552038225993' 
  AND token = 'E9h5VLUqkNPpTZy0DOWRp/2v/gjK/3bpkqL3u9Lb05M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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