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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e85afb0a2a7cafece6b7c1a29d8aea6ae53a3ec04a24b23dc8d1a62e3a7d41' 
  AND token = 'TGen9i152QqCBXnzL6KpGy2jLX6vVM6P895dhIcQp4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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