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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a618f775a3f4fe86c5ba74308e2a986ec855261e69c46f4908c1ea34a15b188' 
  AND token = 'SsIgxPdBUuiUBtbMy96hPmsk0k7rfK4mW5Meh1AxsS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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