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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13029ac7c6dbe6ab8b071a7e190ee45da46b68f53ee21806c23178b2c5144ef6' 
  AND token = '2FjFPgs5IjQYhiXuaNZhIFuCzOqAyfoJnOB82n3klMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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