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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5add4f00500ac2b8f77363235624db8cfd47416ca2c18c8d5f881fc7f28fd3' 
  AND token = 'Od88t5zJ9R7TuYZb3NMpGUB/5ynyxBarYJg/I7mcjtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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