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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da7b885afefecae2225232bcb277acf85316c84419178616071a4c84a6d4557' 
  AND token = 'jXtiq19xyzSpFJoc9UBybav9HKVi7DfKTFY1er8bE3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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