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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab230f7712b5b6d49b69c543e1aa8c783f7a66ed9d2b6d4c11d1863d187965d' 
  AND token = 'GheuP5y3B96F/ME2fLWBd8gK6ss7vKJALHk1mE6hSYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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