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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec7fad9719d4e11645083062e8ba4f90cd24c1f45704171fd32f1cad43a732f' 
  AND token = 'fL28nfZtYpR/y6U4LwD30x/LgdiKNjXvMO1ADmArWNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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