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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81a89fb967d319ebad59947ebb29abf1a7bf42e9f0d40fc9dd4ece32619bddd' 
  AND token = 'HzOh1zu+dxutn0K2qu19AM0cK1c7GrDdWOYBk1L5Qj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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