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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c447e4427f10744b999a89757f774a0e885577f01f5383d93c03806a0bd4a7ed' 
  AND token = 'sgXMxoW1m0v9rUBmA4vTktnYx4VW/gDeoeC/oNIHuCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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