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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a906f8237e0144185d9ff394a43da8c5768c791591e677681cef15cdb6e3ac' 
  AND token = 'hIv0qC4uC2FVcCuoIj2hsW+3RYaSo16n4z7rzFtgLxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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