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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8cd1834b55a80bd9b69f692f7d0fa9b60979ea976bff21f678617be051ccda' 
  AND token = 'vBu9VIiD2I/339fsu07L6/MXirP7GC85tgWl2+mUHpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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