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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcd0a52f84d6ccecb207172a98b4f13338aaf5f79c68e259c567b3744375d5c' 
  AND token = 'fkeEYj/2ucyqFLm8enysMv+++5Ns0T2gI4hAt/+qP94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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