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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035051789bc45f6ee4eef258dd47c6e658ea0f11e9783357ebb09a76a4464059' 
  AND token = 'WCYsJinnBMbKnoA3Pe3j+PTjw1EECyH3Bwe23t1mLho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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