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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40af5d6bdaf99e7b4d928d46785b2e53e36ad0559d8dcfac563c693ba5d9f877' 
  AND token = 'mUNZQF5arKBhGAYKhrlY75pgndobeCvec78v9LWnyN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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