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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8c044edeac64fe8c26c17ab028a17cf18fe178af4f9d03f3ff4d0024d2823c' 
  AND token = 'I++T1QIt/6yAEjbASsV6jGm2JMMlEHZSOD4rVgeP69Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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