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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c83d197ec3fab8da739094048501b0f8e8f68345b40c0060b149af44b1b2ec' 
  AND token = 'WTR1ul7cHqShigTA8WPFZdwIDWB7tZTji2DE/QqFTNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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