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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda1074bd8f70d86f616b099b3d16f430d8283095d12b01af9e8c9097da853d2' 
  AND token = '/3imCNqmblM053lBnokB8l9qWH50pDZNrp14qm0S8NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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