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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713cc1353f1930e86a72d0eae6bca204f36c89f7b43e5b4c9437ca61b3d3a62d' 
  AND token = 'qmA4i0/dPzsb/A9dcrXwsg8HwE4uuqK5EfyLAPqYV/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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