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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9016f602cadb2cdbf9d46cf05845fd0e3bb816243c497491f3b580fd2903cfb' 
  AND token = 'KEQkjLBzy+jtsIDitrKkoZyQZ8a9gt4379TTBMKcbfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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