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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef9d2dc77b7ed636c8ddbcb97c55b8f498663b594e39a389514235202fb2d86' 
  AND token = 'Xn54xgoZb1vGqNHfhv4+Evik0HCB8M4xMOC0fUSDOX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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