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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a108a3c685e4f18ee176ee337fb3a14b6ace563f8d2b0327999ea55636ca2ac' 
  AND token = 'met4I3hSt7E02shY1xlaHlR79phDhW9B+RkWhNppXjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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