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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a89d4f6223243f7c8277a3f72253294ad4b75e52beaf3250f7cc4d06dabdf7' 
  AND token = '2YmKeuGs0Mxi2KLqJz8g1M8wYDwdhVn5g1eJrPt7tf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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