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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd956e39190f4b2f2e8426150df5d2653870bfc50ddce59b204fed0ee6b6ca736' 
  AND token = 'nxaWU6DGSpP1qTu2BpUZGO6gzZhuN0zaLup/GGqN744=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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