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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccc99183c2dd478c9d0a3f94e2b56e87d5b44d261233a98101fa83f6f5bcf98' 
  AND token = 'Ww3uFN5k5ymBJ4/NXDLyCj4x8dbtGEtcsl6qda/u/50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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