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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6513f55f264510c76470dbfb28d91754e210947eb4cff74a0f609600bebbeff3' 
  AND token = 'VVx1B1prH7qFd5fIKoEH0cGUJU+2AoypxXSFymLnUY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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