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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09d57503233e9fad12229da0a3302887cdc800b82ab53a6ea1eaae36a5638c5' 
  AND token = '6adBvwU0EYMqhZaQJ6gWf/VL+JIwiQFEPAV4VOVvfJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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