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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7280ab87b2d25904ba7cc36bc8defef042c036d467008f354f57b2806490b8' 
  AND token = 'gPjHvqNu+OpgNgFQg6k0PLOA1D2BIW49kOtA9xgJq24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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