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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac913fbcfa850e48671f841dd8327c474be5e03708bc3a8f87f6841768a4a9a' 
  AND token = 'MxcokAH2k+WfVbMYIpyL8EJMvHBezYPoWaq5iAajP4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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