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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83c1e155d7abb838620ab551af853b5cb724c1620c20c454da2b958f36b7fdc' 
  AND token = '7stEEDQAtItynJAFO1k0xezb1ynlTk+tqj8MS3DT2uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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