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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bfc5a063f734b5561c106942f7bc5234b3046317081ad2a8149e87fd81797ea' 
  AND token = 'wObXcchJ9ktvpI5aqF8HYx/6MXzREM98D8z5qqInzPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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