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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac105e6627eedd13f94eef7690ed7d6d2d69c2d8f685f380fcf424790b62bdc' 
  AND token = 'geppVteH3YzO9GiQXvcYdeqjQ44jwN+mqE1hF9PoyKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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