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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec0f8cbe3bd412b03b4a88b554b7695a9bf34d2901959af7ba4baafb1206e43' 
  AND token = 'q21bwq0n4pUXqlJegNazdFXcW2kj9p68Z6n/8zb6oww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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