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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11db54618a06454e5f46da8ae46e62be995ea993fd5868ec02e4a821d17e96a' 
  AND token = 'bKCxuUxtnZp0BOiMGiTcIq/7/BFJEs/akYif2U7rceI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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