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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bdc8440ae09cc7b3600a9c7b52f9bbe5133f70c50f6ee6341197897f22e9df' 
  AND token = 'HT1eMcZnu/6LdvfLsBIoKQPeUNKrXcxipjLS9XTPq7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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