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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad6878f1452d61b45a4a2490ee63573d84ca2ca9f1488de91f3d9de4a014736' 
  AND token = 'dkpHye0vr13S4kf999ZBqbLCY3U/ExKiAHwlp1M4RBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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