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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d3ae3650081f3c02e758026afad63fe6da4b675e7f9fa3e7d4d66777e62158' 
  AND token = 'bSVh/mXfJchkUZw9uBFnkXphODSQ79FG3D1nTRGng30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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