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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbbf4fb0ba5b6fdc7e1023eb7ad38ce3496f440e27680094b0a7e5a81cc7011' 
  AND token = '1ozOIl3QB5dBnRJCgdC3jlK6faoozjafaPnS7B/BdHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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