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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95dc68064c742020664ee2a9c9b3d6a889bc5190716bad9be3916ccce8a7d5f' 
  AND token = 'hQ4ijacwONdb5m/9hBDpvZ4ppF0VSSs4QSBOO8ZY50k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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