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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46293f600f4ac84dd149661d194f04f66dc3e5ce26bc5b8eda8fc158aa01381' 
  AND token = '1soB9zZDnoo0SR336gmEg0JANdmjPI6J7v/twLI+nkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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