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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d656b3d8733649d374e8ebfe8179f21285840e297964b595bfd8f09748bd52' 
  AND token = 'esYeKkq9cVV5sx9U8q7HnwIq5xD4GR8EaGKgqjrNz90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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