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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d1da20bbb76188b5542b61a9356300b43d3a47f12e6cabd2423c92ac5729d2' 
  AND token = 'cAit/A6dIrGOSzVtSCbf0IXtwAudejF0HwoGGK15qWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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