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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4545cf050d3cd6200ad7481eac6fe8a68d3343e9cca1244a6f7b4ec5ddc43d57' 
  AND token = '1p3QGIhBRyGpCAE5MSRrvTMR5/1/7G7luyp00k2rcRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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