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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd99052b1f600d8cebaa5c6f28c62017578df86392a362caaad69bd6c3a92bc' 
  AND token = 'QoNgCHYB0f5tq7yivI7yzCN0JR9yTC/NdmcJoTDDrGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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