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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5406dcdea8b3da383a0f2554e44dbe01ba322956d5d8c97719c14de124fc5b9' 
  AND token = 'BHKzta1SALgeaJtekSrkkv4ZSMiIEWgbyy/QGRAAsms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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