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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb98e3fa73f8db657859521c7f2d5939ed1a7a2d25fba56141f12fbbccdc4352' 
  AND token = 'uE7OotOl5V9DfgxC64sdh8TXgK7D/KKETxIXKQfADdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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